I found this website which gives a lot of useful information on the way stone is best preserved.
http://palimpsest.stanford.edu/byauth/clifton/stone/ Alexei ********************* fax: +1 603 853 2666
I found this website which gives a lot of useful information on the way stone is best preserved.
http://palimpsest.stanford.edu/byauth/clifton/stone/ Alexei ********************* fax: +1 603 853 2666